chore(deps): bump qgb contracts version to v2.1.2 (#2598)

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## Overview

Bumps to the latest version of the contracts that use some gas
optimizations.

## Checklist

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- [ ] New and updated code has appropriate documentation
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- [ ] Linked issues closed with keywords

go.mod

@@ -26,7 +26,7 @@ require (
 require (
 	cosmossdk.io/errors v1.0.0-beta.7
 	cosmossdk.io/math v1.1.2
-	github.com/celestiaorg/quantum-gravity-bridge/v2 v2.1.1
+	github.com/celestiaorg/quantum-gravity-bridge/v2 v2.1.2
 	github.com/celestiaorg/rsmt2d v0.11.0
 	github.com/cosmos/cosmos-proto v1.0.0-alpha8
 	github.com/cosmos/cosmos-sdk v0.46.14

go.sum

@@ -186,8 +186,8 @@ github.com/celestiaorg/merkletree v0.0.0-20210714075610-a84dc3ddbbe4 h1:CJdIpo8n
 github.com/celestiaorg/merkletree v0.0.0-20210714075610-a84dc3ddbbe4/go.mod h1:fzuHnhzj1pUygGz+1ZkB3uQbEUL4htqCGJ4Qs2LwMZA=
 github.com/celestiaorg/nmt v0.20.0 h1:9i7ultZ8Wv5ytt8ZRaxKQ5KOOMo4A2K2T/aPGjIlSas=
 github.com/celestiaorg/nmt v0.20.0/go.mod h1:Oz15Ub6YPez9uJV0heoU4WpFctxazuIhKyUtaYNio7E=
-github.com/celestiaorg/quantum-gravity-bridge/v2 v2.1.1 h1:xOBMoRYSh/hnsEW7OLI3bjSJXKlqILfZehjPEK/+3oI=
-github.com/celestiaorg/quantum-gravity-bridge/v2 v2.1.1/go.mod h1:NziNBP12grIi+DH3TqIKUUPM2T6Hl9BTyxiK3+p8yeA=
+github.com/celestiaorg/quantum-gravity-bridge/v2 v2.1.2 h1:Q8nr5SAtDW5gocrBwqwDJcSS/JedqU58WwQA2SP+nXw=
+github.com/celestiaorg/quantum-gravity-bridge/v2 v2.1.2/go.mod h1:s/LzLUw0WeYPJ6qdk4q46jKLOq7rc9Z5Mdrxtfpcigw=
 github.com/celestiaorg/rsmt2d v0.11.0 h1:lcto/637WyTEZR3dLRoNvyuExfnUbxvdvKi3qz/2V4k=
 github.com/celestiaorg/rsmt2d v0.11.0/go.mod h1:6Y580I3gVr0+OVFfW6m2JTwnCCmvW3WfbwSLfuT+HCA=
 github.com/cenkalti/backoff v2.2.1+incompatible h1:tNowT99t7UNflLxfYYSlKYsBpXdEet03Pg2g16Swow4=